Failed to create snapshot for VMx, error -3941 ( create snapshot failed)

hi guys

Right now I have two destinations  both are virtual disk:

250GB from SAN added as a Hard Disk to the vDR

350GB from NFS(external server with NFS enabled) added as a Hard Disk to the vDR

I tested both destinations with VMs around 40GB and they work OK.

but I basically need to backup a Big Hard Disk 350GB only 200GB spaced used.

The backups works OK in the 250GB Hard Disk from SAN

but it fails with error Failed to create snapshot for VMx, error -3941 ( create snapshot failed) just a few  seconds after I start the Backup Job

when trying to backup this vmdk to the NFS

Any idea what could be wrong? NFS issue or something related?

vDR already rebooted and turned off. Same issue

thanks a lot guys